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        <h3 class="mb-3">东华理工大学</h3>
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            <!-- “学校概况”设置为下拉菜单，选项分别为“学校简介”，“现任领导”，“历任领导”，“信息公开” -->
            <li class="nav-item dropdown">
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                    data-toggle="dropdown">学校概况</a>
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                    <a class="dropdown-item actived" href="#">学校简介</a>
                    <a class="dropdown-itemk" href="#">现任领导</a>
                    <a class="dropdown-item" href="#">历任领导</a>
                    <a class="dropdown-item" href="#">信息公开</a>
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                <a class="nav-link" href="#">机构设置</a>
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                <a class="nav-link disabled" href="#">院系设置</a>
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        <!--    垂直分布：导航项占3列，导航选项卡占9列 -->
        <h3 class="mb-3">东华理工大学</h3>
        <ul class="nav nav-tabs">
            <li class="nav-item">
                <a class="nav-link active" href=" ">首页</a>
            </li>
            <!-- “学校概况”设置为下拉菜单，选项分别为“学校简介”，“现任领导”，“历任领导”，“信息公开” -->
            <li class="nav-item dropdown">
                <a class="nav-link dropdown-toggle" data-toggle="dropdown"
                    href="#">学校概况</a>
                <div class="dropdown-menu">
                    <a href="#" class="dropdown-item active">学校简介</a>
                    <a href="#" class="dropdown-item ">现任领导</a>
                    <a href="#" class="dropdown-item ">历任领导</a>
                    <a href="#" class="dropdown-item ">信息公开</a>
                </div>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">机构设置</a>
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                <a class="nav-link disabled" href="#">院系设置</a>
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